TC-P50C1 Single Blink

[n3lka]

Hello to all. First off, great forum, and thanks for all your knowledge.

Okay, I have a Panasonic TC-P50C1 with a single blink error. I have the tc-p50c2 manual, according to them, the single blink means....good luck trying to find an issue I suppose.

Has anyone else ran across this problem and what did you do, I found a couple of c2's with a similar issue, and they said to replace the A board. I want to verify this before I plop down $100+ for a replacement.

I tried looking for voltage test points, but the C2 manual doesn't really give me much to go on there, the power supply board looks totally different from the C1

Thanks,

Brian

[tw2005]

Re: TC-P50C1 Single Blink

generally speaking 1 blink is A board, at least it's the only board that can generate a 1 blink.12

[ricosavy]

Re: TC-P50C1 Single Blink

I had one with same problem but it was c2 not one.ended up being a board once I replaced it gave another code and it had a bad top board that connects to sc board.problem is you need to find some where to get a good board because ebay boards for these models are in demand and I bought two from there none of them worked ended up returning both.problem being the are different versions even if part number is the same might not be right version.i got lucky and found tv on craigslist with broken screen.

[n3lka]

Re: TC-P50C1 Single Blink

Thanks guys, I just wanted to get some confirmation before I pulled the trigger on a baord. I'll cruise craigslist for bad tv's. I usually order from tristate modules, but they're out of stock on it.

I'll update this thread if I find one and it fixes it.

[tw2005]

Re: TC-P50C1 Single Blink

generally speaking 1 blink is A board, at least it's the only board that can generate a 1 blink.12

sorry, I got distracted by my main pc crashed and a flooding storeroom.

What I was also going to add that I did narrow down a 1 blink to a bad SPI flash IC that holds the panel data.You may be able to track down a replacement from a panasonic parts supplier and take a gamble replacing that but could also be the processor that loads the data from that too.

The other thing I was going to suggest just in case it was a false detect is to disconnect all the white ribbons from the A board, power from the SC at SC2, SS at SS11 and the c buffer P35.

power up and see if one blink still holds. I have an equivalent to the "C2" and on that model the A board will start up normal with all that removed but if the 1 blink is still present that confirms A board.

I did get someone else who had a shorted SC board on another model do that and the 1 blink cleared which we have not confirmed was a false trigger as he has not come back with any new news or installed a new Sc yet .

That's an unusual one. We had recently a 1 blink on a 3d model and the SPI flash I talk about just happened to live on an aditional D board which you don't normally see now as usually these just have A boards.

Anyway, after getting him to swap out that D board his 1 blink was fixed. He also could get his TV to start after numerous restarts with the bad board so we suspect it may have been a dodgy BGA chip, once started it would stay on.

I was about to have a quick look at a manual when I discovered I had a BSOD on the network pc.

The SPI Flash ICs are not too dear but it's an unknown gamble but easy enough to remove, 8 pin and a nice size too.

If you had another A board around this era it may me possibly to swap that flash from another board just to fault find it to that chip or not if you're that way inclined.

i have a bit of panasonic junk around the place so I actually swapped a FHD chip onto the HD board just on a hunce and the 1 blink cleared. Put the original back and 1 blink.

that's as much info i have for a 1blink.

EDIT: Also should mention my "C2' started out with 4 blink, PSU shorted by bad SS. I got the 1 blink after fixing the SS.

[tw2005]

Re: TC-P50C1 Single Blink

Just dug into an 42X1 manual which is the same generation using a TNPH0800 A board and the 2009 troubleshooting guide. fault description a little different than I was expecting.

SOS1, No particular checkpoint, Panel status, STB 5V SENSE timeout.

Also I'll have to correct myself. After looking at the manual , what I replaced was an 8 pin chip labelled flash memory , ADDR/DATA which goes to the PD4 processor.

On yours though it's looks a different setup and the IC that's labelled FLASH MEMORY, ADDR/DATA is a 48pin and in the schematic called the PD2M ROM.

So me trying to suggest which chip to take a chance with should probably be disregarded.

Still expect A board issue but they do offer this flowchart for 1blink, unusual as generally they just say replace A. I think they've made a typo mentioning D25, should be P25 I would think.

[n3lka]

Re: TC-P50C1 Single Blink

I got the mainboard in and replaced it. TV comes up, but now on left hand of display, I get vertical lines. Is there a config for the mainboard I have to perform, or is there somehting else wrong with it? I reseated the cables to the board and no change.

[tom66]

Re: TC-P50C1 Single Blink

I would check connections from C board to PDP (panel) are properly seated, that far left one in particular. Note, do NOT reseat any connector on there with power applied or you may fry the panel.

I had a PZ80 doing this too and it turned out when I'd removed the A board I'd sliced through one line of a ribbon cable. Powered up but either half screen was missing (cable one way) or one bar was pink on every 2nd vertical line in the image. Managed to get a replacement ribbon and all was well after that.

[n3lka]

Re: TC-P50C1 Single Blink

Reseated all the cables. I'm wondering if it's a possible bad connection from the board.

[tom66]

Re: TC-P50C1 Single Blink

Even the ones on the C board to the panel? Checked all cables are intact? Could be bad C board then.

[n3lka]

Re: TC-P50C1 Single Blink

C board is on the bottom correct? My first Panasonic, can ya tell? I reseated both on the A and the C board. There was a screw down against the c board when I brought it home, behind the A board, it may've scratched a trace on it....Darn!

If so I'll try to get another c board

[n3lka]

Re: TC-P50C1 Single Blink

Fixed it! It was the replacement A board. I looked on the back of the board where the cables plug in, I saw a chip that may have been reworked.

There were two pins touching. I was able to take a very fine point and clean the two legs, and the picture looks 100% now. The picture I'm attaching is the old bad board, but points out what points were touching.

Let's make sure the rest of the tv works, but thanks for everyone's help so far.

Brian

[tw2005]

Re: TC-P50C1 Single Blink

Fixed it! It was the replacement A board. I looked on the back of the board where the cables plug in, I saw a chip that may have been reworked.

There were two pins touching. I was able to take a very fine point and clean the two legs, and the picture looks 100% now. The picture I'm attaching is the old bad board, but points out what points were touching.

Let's make sure the rest of the tv works, but thanks for everyone's help so far.

Brian

They're resistor banks. interestingly i bridged one of those similar repairing an A coming from a flash chip by error and created 13 blink.

Good job finding that, I was wondering if it was still A looking at the regular lines.

What made you look there?

[n3lka]

Re: TC-P50C1 Single Blink

I have a habit of looking at boards for defects before I rip into them. It didn't look right to me, I thought it was my eye's playing tricks, so I grabbed a jeweler's loupe to get a close look.

I looked at that exact spot, it was on the other side of the where the ribbon cable goes to the C3 board.

I don't know if it was a repair or if it came out of a tv like that. It looks like the solder itself was flattened out, almost like it was sitting on something or something hit it.

I really love this forum, great help from everyone. I've been in electronics for over 30 years, and learn something new everyday thanks to everyone out here.

Brian

[tw2005]

Re: TC-P50C1 Single Blink

I have a habit of looking at boards for defects before I rip into them. It didn't look right to me, I thought it was my eye's playing tricks, so I grabbed a jeweler's loupe to get a close look.

I looked at that exact spot, it was on the other side of the where the ribbon cable goes to the C3 board.

I don't know if it was a repair or if it came out of a tv like that. It looks like the solder itself was flattened out, almost like it was sitting on something or something hit it.

I really love this forum, great help from everyone. I've been in electronics for over 30 years, and learn something new everyday thanks to everyone out here.

Brian

Ha, cats out of the bag. all those years experience , a well trained eye with a mild dose of suspicion.

love your work.

Sounds like it may have flattened like you say looking at where you circled. i was trying to come up with a reason someone would be working there.

[n3lka]

Re: TC-P50C1 Single Blink

Thanks, I'm repairing and selling tv's to make a few bucks. I got laid off from my company of 27 years. They closed my building and merged with another plant. I was overqualified (made too much) to be kept on I suppose. So doing IT and Electronics Consulting to help with my UE benefits until another job comes along.

Like I said, I'm never too proud to ask questions and keep learning.

Thanks everyone!